!include once #1015973 // JavaMail

static void imapCheckConnection(S server, S user, S pass) ctex {
  new Properties props;
  props.setProperty("mail.store.protocol", "imaps");
  Session session = Session.getInstance(props, null);
  Store store = session.getStore();
  store.connect(server, user, pass);
  store.close();
}

Began life as a copy of #1003711